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Acta Phys. -Chim. Sin.  2014, Vol. 30 Issue (3): 508-512    DOI: 10.3866/PKU.WHXB201312302
Effect of Sintering Temperature on the Photocatalytic Activity of Flower-Like Bi2WO6
SHENG Jia-Yi, LI Xiao-Jin, XU Yi-Ming
State Key Laboratory of Silicon Materials, Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China
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Bi2WO6 is reportedly active for the photocatalytic degradation of organic compounds in aerated aqueous solution, but factors influencing the photocatalytic activity of pristine Bi2WO6 have received little attention. In this study, the effect of sintering temperature on the physical properties of flower-like Bi2WO6 was investigated. The catalyst was synthesized through the hydrothermal reaction of Na2WO4 and Bi(NO3)3 at 160 ℃ for 20 h, followed by sintering in air at different temperatures for 3 h. Bi2WO6 samples were characterized with X-ray diffraction, scanning electron microscopy, and Raman, ultraviolet-visible diffuse reflectance, and photoluminescence spectroscopies. All samples had similar phase compositions and electronic structures. Samples exhibited different activities for the photocatalytic degradation of phenol in aerated aqueous solution, under ultraviolet light. With increasing Bi2WO6 sintering temperature, the rate of phenol degradation first increased and then decreased. The maximum rate of phenol degradation was observed from the catalyst sintered at 350 ℃. Similar results were obtained when the rate of phenol degradation was normalized with the specific surface area of the catalyst, as determined by N2 adsorption. The observed sintering temperature-dependent photoactivity of Bi2WO6 was attributed to a combination of its crystallinity, light absorption, and surface defects.

Key wordsBismuth tungstate      Semiconductor      Photocatalysis      Phenol      Degradation     
Received: 22 November 2013      Published: 30 December 2013
MSC2000:  O649  

The project was supported by the National Key Basic Research Program of China (973) (2009CB825300, 2011CB936003).

Cite this article:

SHENG Jia-Yi, LI Xiao-Jin, XU Yi-Ming. Effect of Sintering Temperature on the Photocatalytic Activity of Flower-Like Bi2WO6. Acta Phys. -Chim. Sin., 2014, 30(3): 508-512.

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